Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
12 41 020 Removing and installing/replacing starter motor (N63, S63)
Necessary preliminary tasks:
- Turn off ignition.
- Disconnect battery negative lead.
- Remove RIGHT ENGINE SUPPORT ARM .
Unlock plug (1) and remove.
Slacken nut (2).
Tightening torque 12 42 2AZ .
Detach starter positive cable.
Release screws (1).
Tightening torque 12 41 1AZ .
Disengage cable (2) from holder.
Pull out starter in direction of travel, feed out and remove.
Installation:
Check starter pinion and ring gear for damage. Replace damaged parts if necessary.
Reassemble the vehicle.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.